{"paper":{"title":"The 2175 \\AA\\ extinction feature in the optical afterglow spectrum of GRB 180325A at z=2.25","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. de Ugarte Postigo, B. Sbarufatti, C. Ledoux, D. A. Kann, D. H. Hartmann, D. Malesani, D. Perley, D. Xu, J. Bolmer, J. Hjorth, J. Japelj, J. P. U. Fynbo, J. Selsing, K. E. Heintz, L. Christensen, L. Izzo, L. Kaper, M. Arabsalmani, N. R. Tanvir, P. D'Avanzo, P. Jakobsson, P. M{\\o}ller, R. L. C. Starling, R. Salvaterra, S. Campana, S. Covino, T. Schweyer, T.Zafar, V. D'Elia","submitted_at":"2018-06-01T11:39:02Z","abstract_excerpt":"The UV extinction feature at 2175 \\AA\\ is ubiquitously observed in the Galaxy but is rarely detected at high redshifts. Here we report the spectroscopic detection of the 2175 \\AA\\ bump on the sightline to the \\gamma-ray burst (GRB) afterglow GRB 180325A at z=2.2486, the only unambiguous detection over the past ten years of GRB follow-up, at four different epochs with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT)/X-shooter. Additional photometric observations of the afterglow are obtained with the Gamma-Ray burst Optical and Near-Infrared Detector (GROND). We construct t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.00293","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}